Yes! I worked it out from the previous issue. Unity 4.3 does some funky non-backwards-compatible stuff if you import a package made in pre-4.3, only when you create the project with "2D" defaults. It treats all imported textures as "alpha is transparency" which breaks what tk2d does there. The issue is that its modifying an already valid texture
tk2d 2.4 will detect this and prompts you to change it, but for now you can create your project in "3D" mode, it doesn't really affect anything you do, or you can select all the demo atlas textures and untick Alpha is Transparency & Apply. For this tillemap demo, the texture is at tk2dTileMap_Demo/Demo1/TilemapdemoSpriteCollection Data/atlas0.png.